George b



(No Model.) y

GHB. NORGRAVE.

INSULATOR.

,726. `Patented,"IML 5, 1892.

Wnesses'. J #s UNITED 'STATES PATENT Clarion..y

GEORGE B. NORGRAVE, F PHILADELPHIA, PENNSYLVANIA, ASS-IGNOR TO RICHARD I. BREVSTER, OF NEW YORK, N. Y. I

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 466,726, dated January 5, 1892. Application nea .1ppll9,1a91. serial No. 388,212. (No modell T0 @ZZ whom t may concern:

Be it known that I, GEORGE B. NoRGRAvE, of the city and county of Philadelphia and State of Pennsylvania, have invented an Improvenient in InsulatingS upports for Electric l IVireS, of which the following is a specification.

My invention has reference to insulatingsupports for electric wires; and it consists of lo certain improvements,which are fullyset-forth in the following specification and shown in the accompanying drawings,which form a part thereof.

The object of nly invention is to form an r 5 insulating-support of a convenient construe tion or attachment to the object from which the wires are to be suspended and one in which the Wires may be placed with ease and rapidity by the lineman. For this purpose I emzo ploy a supporting-piece for attachment to the object from which the wire is to be suspended, having supporting-jaws in which two blocks of insulating material, between which the wire is clamped, are inserted. These clamping- 2 5 blocks are held between the jaws without the necessity of employing additional clamps or fasteners.

, In the drawings, Figure l is an end elevation of my improved insulating-support. Fig. 2 is a longitudinal sectional view of the same on the line xof Fig. l. Fig. 3 is a plan view of the same. Fig. 4 is a perspective view of clamping-jaw with the blocks removed. Fig. 5 is a perspective view of the two insulating- 3 5 blocks removed from the clamp; and Fig. 6 is an end elevation similar to Fig. l, illustrating a slight modification of my invention.

A is the main body of the supporting-piece, having two jaws B B, which are inclined toward each other at their ends so as to hold the insulating-blocksD D in place between them. These jaws are preferably inclined outwardly, or away from each other, for a distance, and then inwardly, or toward each other, at their ends, as shown in the drawings. The clamp is provided with a screw C or any other convenient means of attachment to the object from which the wire is to be suspended.

D D are the clamping-blocks, which are 5o made of any suitable insulating material,

. such as glass, porcelain, or clay, and are provided with grooves (l, which are adapted,when the two blocks are placed together, to form an aperture or hole, as shown in Figs. 1, 2, and

6, for the wire. These blocks have their sides formed to correspond with the inclination of the clamping-jaws B B. With the clampingjawsformed tapering outwardly and then'inwardly, as shown in Figs. l and 4, these blocks D D have their sides formed tapering to cor- 6o respond with the taper of the jaws, so that the two blocks are the exact counterparts one of the other. By this construction the use of the male and female blocks which have to be carefully selected and fitted together is obviated, 6 5 all of the blocks being of similar size and shape and equally adapted to be used together without the necessity of matchin g them. The blocks D D are also formed with a slight taper longitudinally, so as to be slightly wedge- 7o shaped iu length, in order that they lnay be wedged in between the jaws B B, as shown in Fig. 3, and thus held iirmly in position. A slight tap witha hammer is sufficient to wedge the blocks in place between the jaws B B.

In Fig. 6 is shown a construction in which the jaws B B are curved instead of tapering outwardly and inwardly, as shown in the other figures. The blocks D D in this construction are formed with curved sides to cor- 8o respond. If desired, the jaws B B may be united to form a continuous piece, as is indicated in dotted lines in Fig. l. In dotted lines in Fig. 6 the jaws are shown formed to receive blocks of an octagonal shape.

In using the device the clalnp A is first attached to the object from which the wire is to be suspended, and one block D is then inserted between the jaws B B and wedged therein. The wire is then placed in the groove 9o d therein and the second block D. is placed upon the flat surface of thelower block D and is driven in place between the jaws B B. The taper or inclination of the ends of the jaws B B toward each other prevents the lblock dropping out from the jaws and the wedge shape or longitudinal taper of the blocks holds them securely in place between the jaws against longitudinal lnovement. When it is desired to release the wire or remove it,a slight Ioo sulating; material, havinglongitudinal grooves d d, having their sides inclined to correspond with the inclination of the jaws B B and ta* pered longitudinally, substantially as and for the purpose speoilied.

In testimony of which invention I have here unto set my hand.

GEORGE B. NORGRAVE.

Witnesses:

ERNEST HOWARD Il UNTER, JOHN A. BRAMLEY. 

